1995 JEEP YJ Service And Repair Manual

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JEEP YJ 1995 Service And Repair Manual REAR WINDOW DEFOGGER
CONTENTS
page page
DIAGNOSIS............................. 1
GENERAL INFORMATION.................. 1SERVICE PROCEDURES................... 3
GENERAL INFORMATION
The electrically-hea

REAR WINDOW DEFOGGER
CONTENTS
page page
DIAGNOSIS............................. 1
GENERAL INFORMATION.................. 1SERVICE PROCEDURES................... 3
GENERAL INFORMATION
The electrically-heated rear window defogger is an
available option on XJ (Cherokee), and YJ (Wrangler)
models equipped with the hardtop roof option. Fol-
lowing are general descriptions of the major compo-
nents in the rear window defogger system. Refer to
Group 8W - Wiring Diagrams for complete circuit de-
scriptions and diagrams.
REAR WINDOW GLASS GRID
The heated rear window glass has two electrically-
conductive vertical bus bars and a series of horizon-
tal grid lines made of a silver-ceramic material,
which is baked on and bonded to the inside surface of
the glass. The grid lines and bus bars comprise a
parallel electrical circuit.
When the rear window defogger switch is placed in
the ON position, current is directed to the rear win-
dow grid lines through the bus bars. The grid lines
heat the rear window to clear the surface of fog or
snow. Circuit protection for the heated grid circuit is
provided by fuse 18 (XJ) or fuse 6 (YJ) in the fuse-
block module.
The grid lines and bus bars are highly resistant to
abrasion. However, it is possible for an open to occur
in an individual grid line resulting in no current flow
through the line. The grid lines can be damaged or
scraped off with sharp instruments. Care should be
taken in cleaning the glass or removing foreign ma-
terials, decals or stickers. Normal glass cleaning sol-
vents or hot water used with rags or toweling is
recommended.A repair kit is available to repair the grid lines and
bus bars, or to reinstall the heated glass pigtail
wires.
DEFOGGER SWITCH
The rear window defogger switch is mounted in the
instrument panel left of the steering column for XJ,
or right of the steering column for YJ. The switch cir-
cuit is protected by fuse 8 (XJ) or fuse 9 (YJ) in the
fuseblock module. Actuating the switch energizes the
relay and electronic timer. A light-emitting diode
(LED) in the switch (XJ), or a indicator lamp in the
switch (YJ), illuminates to indicate when the system
is turned on. The defogger switch can not be re-
paired. If faulty, the switch must be replaced.
DEFOGGER RELAY/TIMER
The defogger relay/timer is located in the relay cen-
ter on XJ models, or taped to the instrument panel
wiring harness behind the parking brake pedal in the
left cowl side area on YJ models. When the rear de-
fogger switch is actuated, the rear defogger relay is
energized. This causes current to flow through the
grid circuit for approximately 10 minutes, or until
the rear window defogger switch or ignition switch
are turned off.
DIAGNOSIS
SYSTEM TESTS
Electrically-heated rear window defogger operation
can be confirmed in the following manner:
(1) Turn the ignition switch to the ON position.
(2) Turn rear window defogger control switch ON.
(3) Monitor vehicle voltmeter. With the control
switch ON, a distinct needle deflection should be
noted.(4) The rear window defogger operation can be
checked by feeling the glass. A distinct difference in
temperature between the grid lines and adjacent
clear glass can be detected within 3 to 4 minutes of
operation.
(5) Using a DC voltmeter, contact terminal A (Fig.
1) (passenger side) with the negative lead, and termi-
JREAR WINDOW DEFOGGER 8N - 1

Page 498 of 2158

JEEP YJ 1995 Service And Repair Manual nal B (driver side) with the positive lead. The volt-
meter should read 10-14 volts.
Steps 3, 4 or 5 above will confirm system operation.
Indicator light illumination means that there is
power availab

nal B (driver side) with the positive lead. The volt-
meter should read 10-14 volts.
Steps 3, 4 or 5 above will confirm system operation.
Indicator light illumination means that there is
power available at the output of the switch, but does
not confirm that power is reaching the rear window
grid lines.
If the rear window defogger does not operate, the
problem should be isolated in the following manner:
(1) Confirm that ignition switch is in ON position.
(2) Ensure that the heated rear window feed and
ground wires are connected to the glass. Confirm
that the ground wire has continuity to ground.
(3) Check fuses 8 and 18 (XJ), or fuses 6 and 9
(YJ) in fuseblock module. Fuses must be tight in
their receptacles and all electrical connections must
be secure.
When the above steps have been completed and the
system is still inoperative, one or more of the follow-
ing is faulty:
²defogger switch²relay/timer
²rear window grid lines (all grid lines would have
to be broken or one of the feed wires disconnected for
the entire system to be inoperative).
If turning the switch ON produces severe voltmeter
deflection, check for a short circuit.
REAR WINDOW GLASS GRID
To detect breaks in grid lines, the following proce-
dure is required:
(1) Turn ignition switch to the ON position. Turn
rear defogger switch ON. The indicator lamp should
light.
(2) Using a 12-volt DC voltmeter, contact vertical
bus bar on passenger side of vehicle (point A of Fig.
1) with negative lead of voltmeter. With positive lead
of voltmeter, contact vertical bus bar on driver side of
vehicle (point B of Fig. 1). The voltmeter should read
10-14 volts.
(3) With negative lead of voltmeter, contact a good
body ground point. The voltage reading should not
change. A different reading indicates a poor ground
connection.
(4) Connect negative lead of voltmeter to point A
on passenger side bus bar and touch each grid line at
mid-point with positive lead. A reading of approxi-
mately 6 volts indicates a line is good. A reading of
zero volts indicates a break in the grid line between
mid-point C and point B. A reading of 10-14 volts in-
dicates a break between mid-point C and point A.
Move toward break and voltage will change as soon
as break is crossed.
Fig. 1 Rear Window Glass Grid Test
8N - 2 REAR WINDOW DEFOGGERJ

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JEEP YJ 1995 Service And Repair Manual DEFOGGER SWITCH
With defogger switch connector separated from de-
fogger switch; turn ignition switch to ON for voltage
tests, or turn ignition switch to OFF for resistance
tests.
(1) Measure voltage

DEFOGGER SWITCH
With defogger switch connector separated from de-
fogger switch; turn ignition switch to ON for voltage
tests, or turn ignition switch to OFF for resistance
tests.
(1) Measure voltage at defogger switch connector
terminal D. The meter should read approximately 5
volts momentarily. If OK, go to next step. If not OK,
repair open from relay.
(2) Refer to switch diagram for resistance tests. If
not OK, replace defogger switch.
DEFOGGER RELAY
With defogger relay connector separated from de-
fogger relay; turn ignition switch to ON for voltage
tests, or turn ignition switch to OFF for resistance
tests.
(1) Measure voltage at relay connector terminal 4.
The meter should read battery voltage. If OK, go to
next step. If not OK, repair open from fuse 18 (XJ) or
fuse 9 (YJ).(2) Measure voltage at relay connector terminal 5.
The meter should read battery voltage. If OK, go to
next step. If not OK, repair open from fuse 8 (XJ), or
fuse 6 (YJ).
(3) Measure resistance between relay connector
terminal 1 and left side (driver's side) of defogger
grid. The meter should read zero ohms. If OK, go to
next step. If not OK, repair open between relay con-
nector and left side of defogger grid.
(4) Measure resistance between relay connector
terminal 2 and a clean chassis ground. The meter
should read zero ohms. If OK, go to next step. If not
OK, repair open between relay connector and ground.
(5) Connect relay connector and measure voltage
at terminal 3. The meter should read approximately
5 volts. If not OK, replace defogger relay.
SERVICE PROCEDURES
REAR WINDOW GLASS GRID REPAIRS
The repair of grid lines, bus bars or pigtail wires
can be accomplished using the MOPAR Rear Window
Defogger Repair Kit (P/N 4267922) or equivalent.
WARNING: MATERIALS CONTAINED IN REPAIR KIT
MAY CAUSE SKIN OR EYE IRRITATION. CONTAINS
EPOXY RESIN AND AMINE TYPE HARDENER,
HARMFUL IF SWALLOWED. AVOID CONTACT WITH
SKIN AND EYES. FOR SKIN, WASH AFFECTED AR-
EAS WITH SOAP AND WATER. DO NOT TAKE IN-
TERNALLY. IF TAKEN INTERNALLY, INDUCE
VOMITING; CALL A PHYSICIAN IMMEDIATELY. IF IN
CONTACT WITH EYES, FLUSH WITH PLENTY OF
WATER. USE WITH ADEQUATE VENTILATION. DO
NOT USE NEAR FIRE OR FLAME. CONTENTS CON-
TAIN 3% FLAMMABLE SOLVENTS. KEEP OUT OF
REACH OF CHILDREN.
(1) Mask repair area so that the conductive epoxy
can be applied neatly. Extend epoxy application onto
the grid line or the bus bar (Fig. 2) on either side of
the break.
(2) Follow instructions in repair kit for preparing
damaged area.
(3) Remove package separator clamp and mix two
conductive epoxy components thoroughly within
packaging. Fold package in half and cut center cor-
ner to dispense epoxy.
(4) For grid line, mask area to be repaired with
masking tape or a template (Fig. 2).(5) Apply epoxy through slit in masking tape or
template. Overlap both ends of the break by at least
19mm (.75 in.).
(6) For a terminal or pigtail replacement, mask ad-
jacent areas so epoxy can be extended onto line as
well as bus bar. Apply a thin layer of epoxy to area
where terminal or pigtail was fastened and onto ad-
jacent grid line.
(7) Apply a thin layer of conductive epoxy to terminal
or bare wire end of pigtail and place in desired location.
To prevent terminal or pigtail from moving while the
epoxy is curing, it must be wedged or clamped.
(8) Carefully remove masking tape from grid line.
CAUTION: Do not allow the glass surface to exceed
400ÉF, glass may fracture.
Fig. 2 Grid Line Repair (Typical)
JREAR WINDOW DEFOGGER 8N - 3

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JEEP YJ 1995 Service And Repair Manual (9) Allow epoxy to cure 24 hours at room tempera-
ture or use heat gun with a 260É-371ÉC (500É-700ÉF)
range for 15 minutes. Hold gun approximately
254mm (10 inches) from repaired area.
(10) After

Page 501 of 2158

JEEP YJ 1995 Service And Repair Manual POWER LOCKS
CONTENTS
page page
DIAGNOSIS............................. 2
GENERAL INFORMATION.................. 1SERVICE PROCEDURES................... 8
GENERAL INFORMATION
Power locks are optional equi

POWER LOCKS
CONTENTS
page page
DIAGNOSIS............................. 2
GENERAL INFORMATION.................. 1SERVICE PROCEDURES................... 8
GENERAL INFORMATION
Power locks are optional equipment on XJ (Chero-
kee) models. Power windows and the keyless entry
system are included on vehicles equipped with the
power lock option. All doors and the liftgate can be
locked and unlocked electrically by operating the
switch on either front door panel, or by operating the
lock and unlock buttons of the remote keyless entry
transmitter. The power lock and keyless entry sys-
tems operate with battery power supplied indepen-
dent of the ignition switch.
Following are general descriptions of the major
components in the power lock system. Refer to Group
8W - Wiring Diagrams for complete circuit descrip-
tions and diagrams. Refer to the owner's manual for
more information on the features and use of these
systems.
POWER LOCK SWITCH
The power locks are controlled by a two-way switch
mounted on the trim panel of each front door. The
switch controls battery feed to the lock and unlock
relays. The door lock switches can not be repaired. If
faulty, the entire switch must be replaced.
POWER LOCK/UNLOCK RELAYS
The power lock and unlock relays are located in the
relay center. The relay center is located on the lower
instrument panel reinforcement behind the lower in-
strument panel and just right of the steering column.
The relays respond to inputs from the power lock
switches and the keyless entry module by sending
the correct battery and ground feeds to the lock mo-
tors. The lock and unlock relays can not be repaired.
If faulty, they must be replaced.
POWER LOCK MOTOR
The locks are actuated by a reversible motor
mounted within each door. The motor direction iscontrolled by the battery and ground feeds from the
power lock/unlock relays. The motor can not be re-
paired. If faulty, the entire motor must be replaced.
KEYLESS ENTRY TRANSMITTER
The keyless entry transmitter is equipped with two
buttons labeled Lock and Unlock. It is also designed
to serve as a key fob and is equipped with a key ring.
Each transmitter has a different vehicle access code,
which must be programmed into the memory of the
keyless entry module in the vehicle in order to oper-
ate the locks. The operating range of the infrared
transmitter signal is up to 4.75 meters (15 feet) from
the receiver.
The transmitter operates on two CR1616 3-volt (or
equivalent) batteries. Typical battery life is from one
to two years.
KEYLESS ENTRY MODULE
The keyless entry module is mounted in a housing
on the headliner near the windshield between the
sunvisors, or inside and towards the rear of the over-
head console (if equipped). This module contains the
keyless entry receiver and program logic for the key-
less entry system.
The keyless entry module has a memory function
to retain the vehicle access code of at least one, and
up to four transmitters. The module receives input
from the remote keyless entry transmitter. In re-
sponse to that input, it is programmed to control out-
puts to the lock and unlock relays. The module can
not be repaired and, if faulty, must be replaced.
JPOWER LOCKS 8P - 1

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JEEP YJ 1995 Service And Repair Manual DIAGNOSIS
As a preliminary system diagnosis, note system op-
eration while you actuate both the Lock and Unlock
functions with the power lock switches and the key-
less entry transmitter. Then, procee

DIAGNOSIS
As a preliminary system diagnosis, note system op-
eration while you actuate both the Lock and Unlock
functions with the power lock switches and the key-
less entry transmitter. Then, proceed as follows:
²If system fails to function with either the switches
or the transmitter, see Power Lock System diagnosis.
²If system functions with both switches, but not the
transmitter, see Keyless Entry Transmitter diagnosis.
²If system functions with transmitter, but not with
one or both switches, see Power Lock System diagno-
sis.
²If one lock fails to operate with the switches or
transmitter, see Power Lock Motor diagnosis.
POWER LOCK SYSTEM
(1) Inspect fuse 13 in fuseblock module. Replace if
necessary. If OK, measure voltage at battery side of
fuse. There should be 12 volts. If not OK, repair open
from Power Distribution Center.
(2) Remove door switch(es) and measure voltage at
terminal 1. Meter should read battery voltage. If OK,
go to next step. If not OK, repair open to fuse 9 in
fuseblock module.
(3) Check door switch continuity as shown in the
applicable charts on the following pages. If OK, go to
next step. If not OK, replace switch.
(4) The power lock/unlock relays are in the relay
center. The relay center is located on the lower in-
strument panel reinforcement just right of the steer-
ing column (Fig. 1). Remove both relays.
(5) Measure resistance between lock and unlock re-
lay terminal 4 (87A) and ground. Meter should read
zero ohms. If OK, go to next step. If not OK, repair
open to ground.
(6) Measure voltage at terminal 2 (87) of both the
lock and unlock relays. Meter should read battery
voltage. If OK, go to next step. If not OK, repair open
to fuse 13 in fuseblock module.(7) Measure resistance between lock and unlock re-
lay terminal 5 (85) and ground. Meter should read
zero ohms. If OK, go to next step. If not OK, repair
open to ground.
(8) Hold driver's side switch in LOCK position.
Measure voltage at lock relay terminal 3 (86). Meter
should read battery voltage. If OK, go to next step. If
not OK, repair open to driver's side switch.
(9) Hold driver's side switch in UNLOCK position.
Measure voltage at unlock relay terminal 3 (86).
Meter should read battery voltage. If OK, go to next
step. If not OK, repair open to driver's side switch.
(10) Hold driver's side switch in LOCK position.
Measure voltage at lock relay terminal 1 (30). Meter
should read battery voltage. If OK, go to next step. If
not OK, replace lock relay.
(11) Hold driver's side switch in UNLOCK position.
Measure voltage at unlock relay terminal 1 (30).
Meter should read battery voltage. If OK, see Power
Lock Motor diagnosis. If not OK, replace unlock re-
lay.Fig. 1 Power Lock/Unlock Relays
8P - 2 POWER LOCKSJ

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JEEP YJ 1995 Service And Repair Manual DRIVERS POWER LOCK SWITCHÐ2-DOOR (LHD)
JPOWER LOCKS 8P - 3

Page 504 of 2158

JEEP YJ 1995 Service And Repair Manual DRIVERS POWER LOCK SWITCHÐ2-DOOR (RHD)
8P - 4 POWER LOCKSJ

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